1ACV12: When Aliens Attack

At the beginning of the episode, when the gang went to the beach, Leela was wearing the same swimsuit as in 1ACV10, with a towel around her waist, and sandals.

Later, when the PE crew was enrolled into DOOP, Leela was wearing the DOOP uniform: red velour top, red velour skirt, white boots and gloves.
Here's a framegrab,a wallpaper made by Leandro, and a pic by Jon Dixon.

Then, at the end of the episode, Leela was wearing a lawyer suit. Blue-green top, blue-green mini-miniskirt, and blue-green high heels. With also, a great looking (?) fake eye.